13 research outputs found

    Efficiency and Sustainability of the Distributed Renewable Hybrid Power Systems Based on the Energy Internet, Blockchain Technology and Smart Contracts-Volume II

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    The climate changes that are becoming visible today are a challenge for the global research community. In this context, renewable energy sources, fuel cell systems, and other energy generating sources must be optimally combined and connected to the grid system using advanced energy transaction methods. As this reprint presents the latest solutions in the implementation of fuel cell and renewable energy in mobile and stationary applications, such as hybrid and microgrid power systems based on the Energy Internet, Blockchain technology, and smart contracts, we hope that they will be of interest to readers working in the related fields mentioned above

    New Trends in Internet of Things, Applications, Challenges, and Solutions

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    Internet of things (IoT) refers to an innovation and advance field to introduce a new concept of technologies with various potential advantages. In IoT, different types of diverse smart devices and gadgets with smart communication interfaces are connected with each other and offers the plethora of services in our daily life. IoT has gained attention in all fields of life like e-home, e-commerce, e-health, smart grids, intelligent transportation systems, and e-governance. The objects in IoT increasing preponderance of entities and transform objects into new and real-world objects. In this review paper, we discuss the new trend in IoT, its applications and recent challenges and their solutions. In addition, the paper also elaborates the existing systems, IoT architecture and technical aspects with future trends in the field. This review will be helpful to new researchers to find the existing technologies and challenges in order to continue their research in the field

    XIII Jornadas de ingeniería telemática (JITEL 2017)

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    Las Jornadas de Ingeniería Telemática (JITEL), organizadas por la Asociación de Telemática (ATEL), constituyen un foro propicio de reunión, debate y divulgación para los grupos que imparten docencia e investigan en temas relacionados con las redes y los servicios telemáticos. Con la organización de este evento se pretende fomentar, por un lado el intercambio de experiencias y resultados, además de la comunicación y cooperación entre los grupos de investigación que trabajan en temas relacionados con la telemática. En paralelo a las tradicionales sesiones que caracterizan los congresos científicos, se desea potenciar actividades más abiertas, que estimulen el intercambio de ideas entre los investigadores experimentados y los noveles, así como la creación de vínculos y puntos de encuentro entre los diferentes grupos o equipos de investigación. Para ello, además de invitar a personas relevantes en los campos correspondientes, se van a incluir sesiones de presentación y debate de las líneas y proyectos activos de los mencionados equiposLloret Mauri, J.; Casares Giner, V. (2018). XIII Jornadas de ingeniería telemática (JITEL 2017). Editorial Universitat Politècnica de València. http://hdl.handle.net/10251/97612EDITORIA

    PERFORMANCE STUDY FOR CAPILLARY MACHINE-TO-MACHINE NETWORKS

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    Communication technologies witness a wide and rapid pervasiveness of wireless machine-to-machine (M2M) communications. It is emerging to apply for data transfer among devices without human intervention. Capillary M2M networks represent a candidate for providing reliable M2M connectivity. In this thesis, we propose a wireless network architecture that aims at supporting a wide range of M2M applications (either real-time or non-real-time) with an acceptable QoS level. The architecture uses capillary gateways to reduce the number of devices communicating directly with a cellular network such as LTE. Moreover, the proposed architecture reduces the traffic load on the cellular network by providing capillary gateways with dual wireless interfaces. One interface is connected to the cellular network, whereas the other is proposed to communicate to the intended destination via a WiFi-based mesh backbone for cost-effectiveness. We study the performance of our proposed architecture with the aid of the ns-2 simulator. An M2M capillary network is simulated in different scenarios by varying multiple factors that affect the system performance. The simulation results measure average packet delay and packet loss to evaluate the quality-of-service (QoS) of the proposed architecture. Our results reveal that the proposed architecture can satisfy the required level of QoS with low traffic load on the cellular network. It also outperforms a cellular-based capillary M2M network and WiFi-based capillary M2M network. This implies a low cost of operation for the service provider while meeting a high-bandwidth service level agreement. In addition, we investigate how the proposed architecture behaves with different factors like the number of capillary gateways, different application traffic rates, the number of backbone routers with different routing protocols, the number of destination servers, and the data rates provided by the LTE and Wi-Fi technologies. Furthermore, the simulation results show that the proposed architecture continues to be reliable in terms of packet delay and packet loss even under a large number of nodes and high application traffic rates

    Managed access dependability for critical services in wireless inter domain environment

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    The Information and Communications Technology (ICT) industry has through the last decades changed and still continues to affect the way people interact with each other and how they access and share information, services and applications in a global market characterized by constant change and evolution. For a networked and highly dynamic society, with consumers and market actors providing infrastructure, networks, services and applications, the mutual dependencies of failure free operations are getting more and more complex. Service Level Agreements (SLAs) between the various actors and users may be used to describe the offerings along with price schemes and promises regarding the delivered quality. However, there is no guarantee for failure free operations whatever efforts and means deployed. A system fails for a number of reasons, but automatic fault handling mechanisms and operational procedures may be used to decrease the probability for service interruptions. The global number of mobile broadband Internet subscriptions surpassed the number of broadband subscriptions over fixed technologies in 2010. The User Equipment (UE) has become a powerful device supporting a number of wireless access technologies and the always best connected opportunities have become a reality. Some services, e.g. health care, smart power grid control, surveillance/monitoring etc. called critical services in this thesis, put high requirements on service dependability. A definition of dependability is the ability to deliver services that can justifiably be trusted. For critical services, the access networks become crucial factors for achieving high dependability. A major challenge in a multi operator, multi technology wireless environment is the mobility of the user that necessitates handovers according to the physical movement. In this thesis it is proposed an approach for how to optimize the dependability for critical services in multi operator, multi technology wireless environment. This approach allows predicting the service availability and continuity at real-time. Predictions of the optimal service availability and continuity are considered crucial for critical services. To increase the dependability for critical services dual homing is proposed where the use of combinations of access points, possibly owned by different operators and using different technologies, are optimized for the specific location and movement of the user. A central part of the thesis is how to ensure the disjointedness of physical and logical resources so important for utilizing the dependability increase potential with dual homing. To address the interdependency issues between physical and logical resources, a study of Operations, Administrations, and Maintenance (OA&M) processes related to the access network of a commercial Global System for Mobile Communications (GSM)/Universal Mobile Telecommunications System (UMTS) operator was performed. The insight obtained by the study provided valuable information of the inter woven dependencies between different actors in the delivery chain of services. Based on the insight gained from the study of OA&M processes a technological neutral information model of physical and logical resources in the access networks is proposed. The model is used for service availability and continuity prediction and to unveil interdependencies between resources for the infrastructure. The model is proposed as an extension of the Media Independent Handover (MIH) framework. A field trial in a commercial network was conducted to verify the feasibility in retrieving the model related information from the operators' Operational Support Systems (OSSs) and to emulate the extension and usage of the MIH framework. In the thesis it is proposed how measurement reports from UE and signaling in networks are used to define virtual cells as part of the proposed extension of the MIH framework. Virtual cells are limited geographical areas where the radio conditions are homogeneous. Virtual cells have radio coverage from a number of access points. A Markovian model is proposed for prediction of the service continuity of a dual homed critical service, where both the infrastructure and radio links are considered. A dependability gain is obtained by choosing a global optimal sequence of access points. Great emphasizes have been on developing computational e cient techniques and near-optimal solutions considered important for being able to predict service continuity at real-time for critical services. The proposed techniques to obtain the global optimal sequence of access points may be used by handover and multi homing mechanisms/protocols for timely handover decisions and access point selections. With the proposed extension of the MIH framework a global optimal sequence of access points providing the highest reliability may be predicted at real-time

    MODEL OF COOPERATIVE APPROACH TO PARKING GUIDANCE SYSTEMS

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    Trend rasta i migracije stanovništva u gradska središta te kontinuirano povećanje broja motornih vozila uzrokuju prometne gužve i zagušenja u većini velikih svjetskih gradova. Jedan od prepoznatih uzroka navedenog negativnog učinka je kruženje u potrazi za raspoloživim parkirališnim mjestom koji ne samo da doprinosi ukupnoj količini zagušenja u gradskim centrima već utječe na količinu vremena koje vozači bespotrebno provode u vozilu, razinu stresa vozača, količinu emisije štetnih plinova, te indirektno na zdravlje i sigurnost svih živih bića. U svrhu otklanjanja problema izazvanim kruženjem u potrazi za raspoloživim parkirališnim mjestom, odnosno zagušenjem, provode se različite metode i pristupi. Prije svega su to odgovarajuće strategije i politike koje se donose s ciljem uređenja postojećeg stanja i demotiviranja dijela stanovništva čiji dolazak u gradski centar nije nužan. Drugi su načini, kojima se u ovome radu posvećuje najveća pažnja, inteligentni parkirališni sustavi. Inteligentni parkirni sustavi se koriste za upućivanje vozača na raspoloživa parkirališna mjesta i pružanje informacija o njihovim karakteristikama. Redovito se koriste i za rezervaciju i naplatu parkiranja, no u najvećem broju slučajeva bili su vezani isključivo za zatvorena parkirališta i garaže. Tehnološkim napretkom i razvojem inteligentnih osjetila postalo je moguće kontrolirati i ulična parkirališna mjesta što se u ovome radu posebno ističe. U radu je analiziran klasičan model traženja raspoloživog parkirališnog mjesta, a zatim je predložen napredni model upućivanja na raspoloživa parkirališna mjesta upotrebom kooperativnog pristupa. Izrađen je simulacijski model predloženog naprednog sustava i ispitani su pokazatelji uspješnosti za četiri različita scenarija u slučaju s i bez zagušenja prometnog toka. Provedena simulacija pokazala je sve prednosti ovakvog sustava u odnosu na klasičan pristup i istaknuti su vodeći čimbenici njegove učinkovitosti.The growth trend and the trend of population migration into city centers, as well as the continuous increase in the number of motor vehicles cause traffic jams and congestions in most major cities in the world. One of the identified factors of the above mentioned negative effect is the circling in search of available parking space, which not only contributes to the total amount of congestion in city centers, but also affects the amount of time that drivers spend unnecessarily in vehicle, the stress level of drivers, the amount of emissions, and, indirectly, the health and safety of living beings. In order to eliminate the problems caused by the circling in search of available parking space, i.e. by the congestion, the different methods and approaches are implemented. First of all, these are the appropriate strategies and policies that are made in order to regulate the existing situation and to demotivate the arrival of part of the population in the city center, which does not represent a necessity. Another way to eliminate the above problem, which is the most emphasized in this paper, is represented by the intelligent parking systems. Intelligent parking systems are used to guide the driver to the available parking space and to provide the information on the characteristics of the same. Regularly they are also used for parking reservation and payment, but in most cases they were related exclusively to closed parking lots and garages. With the technological progress and the development of intelligent sensors it has become possible to even control street parking spaces, which is especially emphasized in this paper. Furthermore, the classic model of search of available parking spaces is analyzed, and then the advanced model of guidance to available parking spaces using a cooperative approach is proposed. The simulation model of the proposed advanced system is developed and indicators of effectivness for four different scenarious in the cases with and without traffic congestion are examined. The simulation analysis presents the advantages of this system compared to the classical approach and main factors of its effectiveness are highlighted

    MODEL OF COOPERATIVE APPROACH TO PARKING GUIDANCE SYSTEMS

    Get PDF
    Trend rasta i migracije stanovništva u gradska središta te kontinuirano povećanje broja motornih vozila uzrokuju prometne gužve i zagušenja u većini velikih svjetskih gradova. Jedan od prepoznatih uzroka navedenog negativnog učinka je kruženje u potrazi za raspoloživim parkirališnim mjestom koji ne samo da doprinosi ukupnoj količini zagušenja u gradskim centrima već utječe na količinu vremena koje vozači bespotrebno provode u vozilu, razinu stresa vozača, količinu emisije štetnih plinova, te indirektno na zdravlje i sigurnost svih živih bića. U svrhu otklanjanja problema izazvanim kruženjem u potrazi za raspoloživim parkirališnim mjestom, odnosno zagušenjem, provode se različite metode i pristupi. Prije svega su to odgovarajuće strategije i politike koje se donose s ciljem uređenja postojećeg stanja i demotiviranja dijela stanovništva čiji dolazak u gradski centar nije nužan. Drugi su načini, kojima se u ovome radu posvećuje najveća pažnja, inteligentni parkirališni sustavi. Inteligentni parkirni sustavi se koriste za upućivanje vozača na raspoloživa parkirališna mjesta i pružanje informacija o njihovim karakteristikama. Redovito se koriste i za rezervaciju i naplatu parkiranja, no u najvećem broju slučajeva bili su vezani isključivo za zatvorena parkirališta i garaže. Tehnološkim napretkom i razvojem inteligentnih osjetila postalo je moguće kontrolirati i ulična parkirališna mjesta što se u ovome radu posebno ističe. U radu je analiziran klasičan model traženja raspoloživog parkirališnog mjesta, a zatim je predložen napredni model upućivanja na raspoloživa parkirališna mjesta upotrebom kooperativnog pristupa. Izrađen je simulacijski model predloženog naprednog sustava i ispitani su pokazatelji uspješnosti za četiri različita scenarija u slučaju s i bez zagušenja prometnog toka. Provedena simulacija pokazala je sve prednosti ovakvog sustava u odnosu na klasičan pristup i istaknuti su vodeći čimbenici njegove učinkovitosti.The growth trend and the trend of population migration into city centers, as well as the continuous increase in the number of motor vehicles cause traffic jams and congestions in most major cities in the world. One of the identified factors of the above mentioned negative effect is the circling in search of available parking space, which not only contributes to the total amount of congestion in city centers, but also affects the amount of time that drivers spend unnecessarily in vehicle, the stress level of drivers, the amount of emissions, and, indirectly, the health and safety of living beings. In order to eliminate the problems caused by the circling in search of available parking space, i.e. by the congestion, the different methods and approaches are implemented. First of all, these are the appropriate strategies and policies that are made in order to regulate the existing situation and to demotivate the arrival of part of the population in the city center, which does not represent a necessity. Another way to eliminate the above problem, which is the most emphasized in this paper, is represented by the intelligent parking systems. Intelligent parking systems are used to guide the driver to the available parking space and to provide the information on the characteristics of the same. Regularly they are also used for parking reservation and payment, but in most cases they were related exclusively to closed parking lots and garages. With the technological progress and the development of intelligent sensors it has become possible to even control street parking spaces, which is especially emphasized in this paper. Furthermore, the classic model of search of available parking spaces is analyzed, and then the advanced model of guidance to available parking spaces using a cooperative approach is proposed. The simulation model of the proposed advanced system is developed and indicators of effectivness for four different scenarious in the cases with and without traffic congestion are examined. The simulation analysis presents the advantages of this system compared to the classical approach and main factors of its effectiveness are highlighted

    Design and implementation of an ITS station to bridge automotive and IoT systems

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    This thesis is about the development of a software package for on-board and road side devices in Intelligent Transport Systems. Such a software implements the stack of an ITS station as standardized by ETSI. The main innovation relies in the integration of an IoT segment based on IETF standards for wireless constrained devices. Prototyped hardware and software are being adopted and field tested in the URBELOG project focusing on last mile logistics in smart cities
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